Currently, you can require that a ticket is categorized before manually closing a ticket with the quick button along the top, or by changing the field itself from open to closed.
Right now though, this doesn't apply to responding to emails, and having an automation that closes the ticket upon response. I feel like this should be an addition to the rule, as I'd imagine most business have automations in place to resolve/close tickets after they respond to get them out of their inbox, and reopen them when a customer responds.
